filter component field to only pass name and slug

lib/site-log.js

@@ -121,7 +121,8 @@ class SiteLog {
 
     if (LogModel && (process.env.DTP_LOG_MONGODB === 'enabled')) {
       try {
-        await LogModel.create({ created: NOW, level, component: this.component, message, metadata });
+        const component = { name: this.component.name, slug: this.component.slug };
+        await LogModel.create({ created: NOW, level, component, message, metadata });
       } catch (error) {
         console.log(
           'failed to write log entry to MongoDB',